Double-D Communication Coil Layout for Wireless Power Isolation
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in achieving efficient isolation between power transfer and communication paths, particularly when using magnetic induction, which can lead to cross-coupling and interference.
Innovation Solution
The use of Double-D coil configurations for wireless communications, where co-planar semi-circular windings with opposite directional currents and shared or hybrid magnetic cores minimize cross-coupling between power and communication coils, ensuring effective isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If magnetic induction is used for wireless power transfer, then power delivery efficiency is improved, but cross-coupling and interference between power and communication paths increases
Solution Approach 1:
The patent divides the wireless communication system into two separate magnetic coupling paths: one for power transfer and one for communication. By segmenting the functions into distinct coil pairs (power transmitting coil with power receiving coil, and communications transmitting coil with communications receiving coil), the system achieves both efficient power delivery and reduced interference between paths.
Solution Approach 2:
The patent introduces a magnetic core as an intermediary element that facilitates magnetic coupling between coils while providing magnetic shielding. The magnetic core acts as a mediator that guides magnetic flux efficiently for power transfer while isolating the communication path from harmful electromagnetic interference generated by the power transfer path.
2Object-generated harmful factors
If separate coils are used for power and communication, then isolation between paths is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into shared components to reduce overall device complexity. Specifically, a single magnetic core structure serves dual purposes: it provides magnetic coupling for both power and communication coils, and acts as magnetic shielding for both paths simultaneously. This merging approach reduces the total number of discrete magnetic components needed while maintaining effective isolation between power and communication paths.
Solution Approach 2:
The magnetic core structure is designed to perform multiple functions universally: it provides magnetic flux guidance for power transfer, magnetic shielding for power path isolation, magnetic flux guidance for communication, and magnetic shielding for communication path isolation. This multi-functionality reduces component count and simplifies the overall device architecture.
3Volume of moving object
If communication coil is placed close to power coil, then device size is reduced, but magnetic coupling and interference control becomes difficult
Solution Approach 1:
The patent employs a nested configuration where communication coils are positioned within or adjacent to the magnetic core structure that also houses the power coils. The communication transmitting coil is placed near the magnetic core, and the communications receiving coil is positioned to couple with it, creating a compact nested arrangement that maintains strong magnetic coupling while using the magnetic core for shielding and flux guidance.
Solution Approach 2:
The magnetic core serves as an intermediary that enables close proximity placement of power and communication coils while maintaining reliable magnetic coupling and controlling interference. The magnetic core guides and confines magnetic flux between the power coils and between the communication coils, ensuring efficient coupling even at close distances while preventing cross-path interference through magnetic shielding.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration achieves sufficient magnetic coupling for both power transfer and communication operations while reducing interference, enabling higher communication bandwidth and efficient power delivery.
Implementation Method 1
a power receiving coil configured to be magnetically coupled to a power transmitting coil of a wireless power transmitter, wireless power receiving circuitry configured to receive energy from the power receiving coil
Implementation Method 2
a wireless communications coil coupled to the processing and communications system, the communications coil comprising one or more windings configured to be magnetically coupled to a vertical communications coil of the wireless power transmitter to allow communications
Data Source
AI summary
A device can include a wireless power transfer coil configured to be magnetically coupled to a wireless power transfer coil of a complementary device, wireless power transfer circuitry, a processing and communications system, and a wireless communications coil coupled to the processing and communications system, the communications coil comprising one or more windings configured to be magnetically coupled to a vertical communications coil of the complementary device to allow communications between the processing and communications system and the complementary device, wherein the one or more windings of the communications coil are disposed in at least one plane parallel to the plane of the vertical communications coil.